5. FUNCTIONAL DESCRIPTION
6
EPSON
S1F76540M0C Series Technical Manual
(Rev.1.1)
5.3 Reference Voltage Circuit
S1F76540 contains a reference voltage circuit for a voltage stabilization circuit (regulator).
The stabilizing potential described in Section 5.4 is defined with the split ratio between the external resistance
and reference voltage values.
The reference voltage allows you to change the temperature coefficient using the TC1 and TC2 pins, and you
can select one of four modes shown in Table 5.2.
Table 5.2 Reference voltage temperature coefficient settings
Reference voltage value V
REF
(V)
(Note 1)
Temperature coefficient CT (
%
/
°
C)
(Note 2)
Mode
name
TC1
(H=V
DD
)
(L=VI)
TC2
(H=V
DD
)
(L=VI)
Min. Typ. Max. Min. Typ. Max.
CT0 H
H -1.55 -1.5 -1.45 -0.07 -0.05 -0.03
CT1 H
L -1.62 -1.5 -1.38 -0.19 -0.15 -0.11
CT2 L
H -1.65 -1.5 -1.35 -0.42 -0.35 -0.28
CT3 L
L -1.70 -1.5 -1.30 -0.65 -0.55 -0.45
(Note 1) The reference voltage is based on Ta = 25°C.
(Note 2) The temperature gradient CT is defined in the following expression: In Table 5.2, the negative sign
assigned to CT means that |V
REF
| reduces as the temperature rises.
CT
=
×
50
°
C - 0
°
C
|
V
REF
(50
°
C)
|
-
|
V
REF
(0
°
C)
|
|
V
REF
(25
°
C)
|
100
(Note on switching the TC1 and TC2 pins)
When switching the TC1 and TC2 pins after power-on, be sure to turn the power off (POFF1X=POFF2X=VI).
